Boring jig construction



May 19, 1959 B. A. MCCUEN 2,886,989

BORING .11s CONSTRUCTION Filed Jan. 14. 1954 2 Sheets-Shet 1 INVENTOR Ni? ozz JLMcCz/Len May 19,1959 B. A-MccuEN 2,835,989

' BORING JIG CONSTRUCTION Filed Jam. 14; 1954 I 2 Sheets-Sheet 2 INVENTOR United States Patent BORING JIG CONSTRUCTION Burton A. McCueu, Ashburnham, Mass., assignor to Independent Lock Company, Fitchburg, Mass, at corporation of Massachusetts Application January 14, 1954, Serial No. 404,097

9 Claims. (Cl. 77--62) This invention relates to boring jigs, and more particularly to boring jigs especially adapted for the formation of drill holes on doors for the reception of latch bolt casings and knob retractor mechanisms.

This application is a continuation-impart of my appli cation Serial No. 323,677, filed December 2, 1952, now Patent No. 2,792,727, issued May 21, 1957.

An object of the present invention is to provide a boring jig for use in preparing doors for the insertion of cylindrical and tubular locks and latches, the structure of the jig being arranged to effect speedy and accurately coordinated bore holes for the latch and lock casings without the requirement of any special skill on the part of the operator. The boring jig herein is adapted for use on doors made of solid or laminated wood or other compositions or combinations of materials.

Another object of the present invention is to provide a boring jig having means for adjustably locating the bore hole or -backset" for the knob retractor mechanism, as well as means for ensuring a clean, splinterless bore hole.

A further object of the invention is the provision of means for mounting and guiding an auger for rapidly cutting transverse holes in the frame of a door, said means being adapted for quick release of the auger in order to permit cleaning the hole of chips and debris.

Still other objects and advantages of my invention will be apparent from the specification.

. To attain these objects and such other objects as may appear herein or be hereinafter pointed out, reference is made to the accompanying drawing forming a part hereof, in which: it

Figure 1 is a perspective view, partly in phantom out- Figure 4 is a view taken on the line 4-4 of Figure 2,

partly in section, in elevation and in phantomoutline; Figure 5 is a view taken on line 5--5 of Flgure 2, partly in section, in elevation and in phantom outline; and

Figure 6 is a view taken on the line 6-6 of Figure 2,

partly in section, in elevation and phantom outline and including a portion of a door.

In preparing a door for the reception of latch bolt casings and knob retractor mechanisms, it, is necessary to make an edge bore hole in the edge of the door to receive the latch bolt casing, and a transverse bore hole to receive the knob retractor mechanism. These two holes must be aligned or coordinated wtih each other in a manner so that the cooperating mechanisms within the latch bolt casing and the knob retractor mechanism may cooperate properly. v v

To accomplish this purpose, referenceis made to Fig ure 1, wherein is shown a jig, generally designated 11,

21,886,989 Patented May 19, 1959 comprising a rear jaw or clamp member 12 having a ring shaped head 13 integral therewith. In the clamping face 14 of the ring 13 is an annular recess 15 into which is seated a replaceable ring 16 fixed in position by set screw 17 extending radially through ring 13. Ring 16 may be provided optionally with a bevelled lip or cutting edge 18, projecting slightly from the surface of the clamping face of the ring, as shown in Figure 6. The other end of clamp member 12 terminates in shank 19 forming a part of the actuating mechanism as will appear hereafter.

Front jaw or clamp member, generally designated 21, is shaped similarly though not necessarily to clamp member 12 and lies in a complemental position relative thereto. Clamp member 21 has a shank portion 22 and a ring shaped head 23 having an aperture substantially axially aligned with the aperture of ring head 13.

For disposing the jig in clamping engagement with the door edge, shank 19 is provided with a guide pin 24 attached thereto, extending perpendicularly and projecting slidably through guide slot 25 in shank 22. See Figure 4. Shank 22 is also provided with a guide pin 26 attached thereto and extending perpendicularly and projecting slidably through a guide slot 27 in shank 19. See Figure 5.

Paired with guide pin 26 is a feed screw 28 having adjacent each end oppositely pitched screw threads 29 and 31 threadably engaged by complemental borings in shanks 22 and 19, respectively. Attached to one end of feed screw 28 is turn knob 32 for manual rotation thereof.

The positions of clamp members 12 and 21 relative to each other are locked by means of lock bolt 33 threadably engaged in a suitable boring in the shank 19. The nose 34 of bolt 33 abuts the inner face of clamp member 22 and serves to tighten the clamp members in position against the action of feed screw 28. Attached to the free end of bolt 33 is a turn knob 35 for manual rotation thereof. It will be noted that for ease of handling, feed screw 23 and blocking bolt 33 have their threadings pitched in such a manner that turn knobs 32 and 35 will be rotated in the same direction either for tightening or loosening the clamp members to or from the door, as the case may be.

Mounted on the portion of feed screw 28 intermediate clamp members 12 and 21 is the base 36 of a bit guide, said base being perforatedtransversely in four places to receive feed screw 28, guide pins 24 and 26, and locking bolt 33. It will be noted that the guide pins and locking bolt are slidably disposed within their respective apertures in base 36. Feed screw 28, however, is provided with a pair of flanges 37 and 38 (Figure 5), that abut the sides of base 36, thereby controlling the spatial relationship between said base and the inner faces of clamp members 12 and 21. As feed screw 28 is turned, clamp members 12 and 21 move equal distances to or from the center of the axial line through base 36.

Extending upwardly from the base 36 is a socket member 39 having a cylindrical guide aperture of predetermined size and an upwardly and forwardly extending bracket 41, the forward face 42 of which is coextensive with the forward edge 43 of base 36 to provide a bearing face normal to the axial line through the socket member 39. Slidably insertable into socket member 39 is tubular bit guide 44 of a second predetermined size, which may be replaceably secured in position by means of set screw 45 extending radially through the Wall of the member 39. On the front end of bit guide 44 are an upwardly extending face plate branch 46 and a downwardly extending face plate branch 47, the rear faces of said face plates abutting against extension 41 and the edge 43 of base 36 respectively. The forward faces 48 and 49 of plates 46 and 47, respectively, are aligned and adapted to abut the edge 51 of door 50, as shown in Figure 3 with their faces at an angle normal to the axial line of the socket 39 and gauge a distance equal to the thickness of the plates 46 and 47.

Front clamp member 21 is provided with an arcuate boss 52 that partially encircles the aperture in ring 23. Boss 52 has an arcuate collar 53 which is spaced apart from ring 23, extends partly inwardly towardthe axial center of said ring and has an arcuate annulus 54 Mounted in said annulus 54, and secured to collar 53 by means of screws 55 and 56 is a replaceable but stationary segment 57 of a split threaded bushing. Collar 53 has an arcuate recess 58 into which the flange 59 of the bushing segment 57 fits, said flange serving to relieve screws 55 and 56 of any shear stresses. The other segment 61 of the split bushing is pivotally connected to segment 57 by means of link 62 pivotally connected to pins 63 and 64, in segments 57 and 61, respectively.

Segments 57 and 61 have slots 65 and 66, respectively, adapted to receive the shank of bolts 67 pivotally connected to segment 57 by means of pin 68. The end of bolt 67 is threaded and is adapted to receive a wing nut 69 which secures the two segments of the split bushing together.

The internal arcuate peripheries or the annulus formed by segments 57 and 61 are threaded together as a unit and are adapted to receive the threaded shank 71 of an auger bit, which when secured therein, is mounted transversely to clamp members 12 and 21 and is adapted to feed through the axial center of rings 13 and 23. Mounted on shank 71 is an auger head 72 positioned generally transversely of the shank and comprising a face cutter 73 radially extending along the head, with rake and clearance on its surfaces 74 and 75, designed for cutting wood or the like, as used in door frames. A scoring arm 76 has an edge 77 diametrically terminating in an arcuate scoring spur 78. Auger head 72 is provided with a center spur 79 which may have a threaded periphery, the number and pitch of its threads corresponding with those on shank 71.

The free end of shank 71 is squared or otherwise formed with a keying outline to receive crank hub 81 in keying engagement with a suitable squared slot provided therein. A crank shaft 82 and handle 83 are mounted on hub 81 for manual rotation of shank 71.

In operation, the boring jig is applied to door 50 (Figures 3 and 6) by disposing clamp members 12 and 21 on opposite faces thereof with face plates 46 and 47 for one calculated backset position abutting flush against the edge of the door, thereby automatically locating rings 13 and 23 in proper position. Where longer latch cases are required or greater backset, bit guide 44 may be removed completely to abut faces 42 and 43 with the door edge to provide a bore guide of larger cross section or be replaced with another having thinner face plates 46 and 47. Thereupon, turn knob 32 is actuated to turn feed screw 28 to bring clamp members 12 and 21 into clamping engagement with the door.

When firm clamping engagement has been achieved, locking bolt 33 is tightened by means of turn knob 35 to hold the jig assembly firmly in position. Crank 32 may now be rotated in a thread feed and cutting direction, thereby thread feeding auger head 72 forwardly and cutting a transverse hole 80 (Figure 6) through the door body from one face of the door to the other, until the cutter head enters into the aperture of ring 16. Ring 16 is replaceable in annular recess 15 with other rings having internal diameters of different dimensions, whereby the jig may be adapted to produce transverse holes 30 of different sizes, as may be. required. Each ring 16 with different internal diameters will require the use of an auger head 72 having substantially corresponding outside diameters to produce clean holes without splintering.

While ring 16 may have. a sharp edge at its clamping face, good results are also obtained by providing a bevelled edge 18 on said ring, so that, as face cutter 73 and scoring spur 78 on auger head 72 cut through the last portion of the door, the outer portion of the door will not splinter because of the bending action caused by said bevelled edge, thereby providing for a smooth out on the rear face of the door and obviating a jagged effect. This is all accomplished from one side of the door without shifting the jig or using any counter-block. Furthermore, the diameters of the cross bore may be varied in the same door by clamping augers in the midst of an operation to secure a step through hole, if desired.

After the transverse hole in the door has been drilled, the auger bit may be quickly and easily removed from the hole by removing the crank 82 from the shank 71, loosening wing nut 69 and pivotally upending bolt 67 to free segment 61 of the split bushing. Segment 61 is then pivoted to free shank 71 from the bushing threadings, after which the operator may push the shank 71 and the auger head 72 through the drilled hole in the door, through the ring 16 and remove the auger bit complete through the ring shaped head 13.

It is apparent that with different types of material, the split bushing may be replaced by other bushings having threadings of different pitches, into which there may be placed shanks 71 with corresponding pitches so that different materials of different hardnesses may be drilled at different rates for each turn of the shank 71.

After transverse hole has been bored and auger shank 71 and auger head 72 are removed, a boring bit may then be inserted through the bit guide 44 to bore hole 84 (Figure 3) substantially perpendicular to transverse hole 80 for the insertion of a latch case to cooperate with the knob retractor mechanism inserted into the transverse hole. Bit guide 44 may be replaced with other bit guides having different diameters when latch cases of different sizes are to be utilized.

While I have described that the bit guide 44 may completely be removed where deeper backsets and larger augers are to be used the bit guide 44 may also be inserted only partially into member 39 and secured therein by set screw 45, whereby different gauging positions may be secured by guide 44 and the location of ring members 13 and 23 will define the position of the transverse hole 30 closer to edge 50 of door 52. This expedient may be utilized when locks having shorter latch cases are to be inserted into the door. Suitable indexing means may be formed on cylindrical member 44 to indicate its anchoring position in accordance with the requirements of corresponding latch member lengths.

In the specification, I have explained the principles of my invention, and the best mode in which I have contemplated applying those principles, so as to distinguish my invention from other inventions; and I have particularly pointed out and distinctly claimed the part, mode or combination which I claim as my invention or discovery.

I have found that by screw feeding the auger 72, the stresses bring the clamping members 13 and 21 into engagement which are maintained against the door throughout the boring operation rather than to produce any dislodging tendencies by reason of the manual operation and that the clamp feeding mechanisms 26, 28, 33 are also benefited to perform and maintain their effectiveness with minimum marring influence on the door to which the jig is clamped, while retaining the bit guide in true normal relation to the end bore guide 44 and augmenting the locking action in the clamping position.

Thus, by maintaining the feed of the clamping means and the screw feed of the auger in parallelism, the effectiveness of each of these elements is augmented in relation to each other, rather than to alter the same.

Likewise I have found. that the bite of the bevelled edge of ring 1 6 into the wood when clamped firmly by the clamp feeding mechanisms 28, 29 and 33 produces a secure fastening of the boring jig in its proper position on the doorand, thereby effectively resists a tendency oftheboring jig to become dislodged while the manual operations of boring are being performed. Thus, accuracy of the original setting of the boring jig on'the door is maintained throughout the operation and at the same time a marring influence on surfaces of the door which will not be covered by the lock trim is minimized.

While I have shown and described certain preferred embodiments of my invention, it will be understood that modifications and changes may be made without departing from the function and scope thereof, as will be clear to those skilled in the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is:

l. A boring jig having a replaceable auger with a shank of uniform diameter and an auger head for boring holes in wooden doors or the like frame members from one face through to another, and for guiding said auger for such operation, said jig having in combination a front jaw clamp member having a generally ring shaped head, a rear jaw clamp member having a completely formed ring shaped head, guide members coupling said clamp members with the ring portions thereof in axial alignment normal to said clamping faces, said front jaw clamp member having a threaded auger guide axially located with respect to said ring shaped heads, thread means cooperating with said threads on said auger guide to feed and maintain said auger axially aligned with said ring shaped heads, said rear clamp member having a replaceable ring shaped work engaging edge faced toward and conforming substantially to the desired boring and cooperating with said auger head to prevent splintering of the wood on the emerging face of the work.

2. A boring jig in accordance with claim 1 wherein said ring shaped work engaging edge has a seat conforming to said head cooperating with said replaceable ring member whereby, upon replacement of said auger with an auger head of different size, a correspondingly contoured, ring-shaped member may be replaced on said seat.

3. A boring jig in accordance with claim 1 wherein said work engaging edge comprises a bevelled outwardly extended lip to indent the work and provide a clean, splinterless hole.

4. A boring jig for boring holes in wood doors or the like frame members from one face through to the other and guiding an anger for such operation with an anger which has a shank of uniform diameter extended over a length greater than the thickness of the door, said jig having, in combination, a first jaw clamp member having a generally ring-shaped head, a second, oppositely positioned, complementary jaw member having a completely formed ring shaped head, ring portions on each of said heads, guide members for said members by which the ring portions are held in alignment axially normal to the clamping faces thereof, means for feeding said jaws to and from each other to clamping and releasing position along said guide members, the first of said clamp jaw clamp members having an auger guide axially located with respect to said ring shaped heads for guiding said shank to maintain said auger aligned with each of said ring-shaped heads substantially normal to the face of said heads, the second of said jaw members having a locating seat on an inner face concentric with said ringshaped head cooperating with a replaceable ring member whereby upon replacement of said auger with one having a head of different size, a correspondingly contoured ring shaped member may be replaced on said seat.

5. A boring jig for boring holes in wood doors or the like frame members from one face through to the other and guiding an auger for such operation with an auger which has a shank of uniform diameter extended over a length greater than the thickness of the door, said jig having, in combination, a first jaw clamp member having a generally ring-shaped head, a second, oppositely positioned, complementary jaw member having 'a'completely formed ring-shaped head, the ring portions on each of said heads being held in alignment axially by guide members forsaid jaw clamp members normal to the clamping faces thereof, means for feeding said jaws to and from each other to clamping and releasing position along said guide means, one of said clamp jaw clamp members having an auger guide axially located with respect to said ringshaped heads for guiding said shank to maintain said auger aligned with each of said ring-shaped heads substantially normal to the face of said heads, the other of said jaw members having a replaceable ring including a bevelled edge lip whereby to indent the work and provide a clean, splinterless hole upon replacement. of said auger with an auger corresponding to said replaced ring.

6. A boring jig for boring holes in wood doors or the like frame members from one face through to the other and guiding an auger for such operation with an anger which has a shank of uniform diameter extended over a length greater than the thickness of the door, said jig having, in combination, a first jaw clamp member having a generally ring-shaped head, a second, oppositely positioned complementary jaw member having a completely formed ring-shaped head, the ring portions on each of said heads being held in alignment axially by guide members for said jaw clamp members normal to the clamping faces thereof, means for feeding said jaws to and from each other to clamping and releasing position along said guide means, one of said clamp jaw clamp members having an auger guide axially located with respect to said ring-shaped heads for guiding said shank to maintain said auger aligned with each of said ring-shaped heads substantially normal to the face of said heads, the other of said jaw members having a bevelled edge lip whereby to indent the work and provide a clean, splinterless hole and a replaceable bit guide having door edge abutting face plate means supported on said means for feeding said jaws arranged to be held in edge abutting contact with the door to restrain rotational movement of said jaw mem bers.

7. A boring jig in accordance with claim 1 wherein said auger guide comprises a split bushing having separable segments and means for alternatively holding said segments in locked and freed separable position relatively to each other whereby said shank may be alternatively locked in and freed from threaded engagement with said auger guide member whereby the auger may be drawn bodily through the bored hole and the ring-shaped head of the rear jaw clamp member.

8. A boring jig for boring a latch case hole and a transverse latch retracting mechanism hole in the frame of a door or the like comprising a pair of clamp members, bit guide means mounted between said members for guiding a bit to bore said first mentioned hole, said bit guide means having a door edge bearing face, an auger guide mounted on one of said clamp members and arranged to guide an auger transversely through both said clamp members to bore said transverse latch retracting mechanism hole, replaceable face plate means on said bit guide means for adjusting the position of said clamp members in relation to the door edge, said face plate means having a tubular guide of predeterminedly smaller diameter than said bit guide means, and extensions to engage said bearing face of said bit guide means whereby the backset location of said transverse hole is controlled in relation to said door edge and whereby said bit guide means or face plate means may alternatively be used with bits of differing bore sizes.

9. A boring jig in accordance with claim 8 wherein said tubular guide of said face plate means is nested within said bit guide means, the thickness of said face plate means operating to gauge the backset location of the transverse hole.

(References on following page) References Cited in, the filo. of-this patent j 2,332,295 UNITED STATES PATENTS 891,606 Doldt et a1. June 23, 1908 2 13 1,494,969 Wadell May 20, 1924 5 2 792 727 1,856,485 Kirkbride May 3, 1932 1,919,900 Moller July 25, 1933 2,193,204 Nilson Mar. 12, 1940 154 073 2,230,645 Jones Feb. 4, 1941 8 1 Bouehal Oct. 19, 1943 Hengst "a", "-2 Aug, 22,. 1.95 0 WeHman. -re J ly 8, 1952 Castle. July 7, 1.953 MeCuen May 21, 1957 FOREIGN PATENTS Great Britain Nov. 25, 1920 

